s2e2 0.1.1

What's new:

• Evaluator checks added functions and operators for null
• Fixed unit tests
• Updated requirement for Maven version

s2e2 0.1.0

First release of s2e2.java library.

• Implemented functions: ADD_DAYS, FORMAT_DATE, IF, NOW, REPLACE
• Implemented operators: +, ==, !=, >, >=, <, <=, &&, ||, !